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class="NyNewsdetail_title">PH計(jì)與ORP計(jì)的區(qū)別在哪兒？</h1> <div id="sq82xwe7wu" class="NyNewsdetail_tips">更新時(shí)間：2018-03-09 點(diǎn)擊次數(shù)：4651</div> <div id="sq82xwe7wu" class="NyNewsdetail_con" id="c_detail_wrap"> <p> 自然界的水體中，存在著多種變價(jià)的離子和溶解氧。當(dāng)一些污水排入水中，水中含有大量的離子和有機(jī)物質(zhì)，由于離子間性質(zhì)不同，在水體中發(fā)生氧化還原反應(yīng)并趨于平衡。因此在自然界的水體中不是單一的氧化還原系統(tǒng)，而是一個(gè)氧化還原的混合系統(tǒng)。</p><p> 測(cè)量電極所反映的也是一個(gè)混合電位，它具有很大的試驗(yàn)性誤差。另外，溶液的pH值也對(duì)ORP值有影響。因此，在實(shí)際測(cè)量過(guò)程中強(qiáng)調(diào)溶液的電位是沒(méi)有意義的。我們可以說(shuō)溶液的ORP值在某一數(shù)值點(diǎn)附近表示了溶液的一種還原或氧化狀態(tài)，或表示了溶液的某種性質(zhì)（如衛(wèi)生程度等），但這個(gè)數(shù)值會(huì)有較大的不同，無(wú)法對(duì)它作出定量的確定，這和pH測(cè)試中的準(zhǔn)確度是兩個(gè)概念。另外，影響ORP值的溫度系數(shù)也是一個(gè)變量，無(wú)法修正，因此ORP計(jì)一般都沒(méi)有溫度補(bǔ)償功能。</p><p> ORP是英文Oxidation-Reduction Potential的縮寫(xiě)，它表示溶液的氧化還原電位。ORP值是水溶液氧化還原能力的測(cè)量指標(biāo)，其單位是mv。它由ORP復(fù)合電極和mv計(jì)組成。ORP電極是一種可以在其敏感層表面進(jìn)行電子吸收或釋放的電極，該敏感層是一種惰性金屬，通常是用鉑和金來(lái)制作。參比電極是和pH電極一樣的銀/氯化銀電極。</p><p> ORP常用于溶液中電位值的連續(xù)監(jiān)測(cè)，pH計(jì)則用于酸堿度的檢測(cè)，一般的pH計(jì)也可以測(cè)量ORP值，在ph計(jì)上的顯示調(diào)節(jié)按鈕擋上，其中有個(gè)注明的是“mv”字樣的按鈕擋，mv檔測(cè)的是氧化還原電位（ORP）。pH計(jì)和ORP計(jì)可以共用一個(gè)顯示表，但是使用的是不一樣的電極，ORP計(jì)要用ORP電極。</p><p> 氧化還原電極可以使用于任何pH/mv測(cè)定計(jì)上。ORP計(jì)使用時(shí)無(wú)需標(biāo)定，直接使用即可，只有對(duì)ORP電極的品質(zhì)或測(cè)試結(jié)果有疑問(wèn)時(shí)，可用ORP標(biāo)準(zhǔn)溶液檢查電位是否在200-275mv之間，以判斷ORP電極或儀器的好壞。ORP測(cè)量電極（鉑或金），其表面應(yīng)該是光亮的，粗糙的或受污染的表面會(huì)影響電極的電位（mv）。</p><p> 氧化還原電位ORP在線(xiàn)監(jiān)測(cè)，能反映出池中氧化性物質(zhì)或還原性物質(zhì)的相對(duì)多少，ORP在線(xiàn)監(jiān)測(cè)還能反應(yīng)氧化還原進(jìn)行的好壞，運(yùn)用ORP指標(biāo)對(duì)工藝流程進(jìn)行調(diào)整可以起到事倍功半的效果。</p><p style="text-align: center;"><img alt="" src="http://img50.chem17.com/9/20180309/636562012734966392253.jpg" style="height:558px; width:610px" /></p> </div> <div id="sq82xwe7wu" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/jsshengaohua-News-1045863/">好產(chǎn)品如何評(píng)判？盛奧華用實(shí)驗(yàn)來(lái)證明</a></li> <li>下一篇：<a 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